Steam-boiler.



No. 663,364. Patented Dec. 4, |900.

J. SCHTTE.

STEAM Bones.

(Application led July 5, 1899.)

UNTTnn STATES PATENT Trice.

JOHANN SOHTTE, OF BREMERHAVEN, GERMANY.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 663,364, dated December 4, 1900.

Application led July 5, 1899. erial No. 722,890. (No model.)

To LZ/Z whom, t nu@ concern:

Be it known that I, JOHANN SCHTTE, a subject-of the German Emperor, residing in Bremerhaven, Germany, have invented certain new and useful Improvements in Steam-Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

In comparison with ordinary marine boilers water-tube boilers have the advantage of smaller weight and of generating steam more rapidly. Therefore they are `employed in the navies of the different countries. OuV the other hand, they have the disadvantage of consu ming about twenty-six per cent. more coal and of being more subject to repairs. Therefore they are not employed in the mercantile navies.

The object of the present invention is to provide a boiler which combines the advantages of both the cylindrical and the watertube boilers. To this end the boiler must fulfil the following conditions: First, it must have a smaller weight and water-space than a cylindrical boiler of the same heating-surface; second, as is the case in a locomotive or cylindrical boiler, the [iames which are produced in different grates must unite in a large space in the combustion-chamber and then be divided into hundreds of parts,where by the coal and the heating-gases therefrom can alone be thoroughly and effectively consumed; third, it must be readily accessible and easy to clean without the necessity of so many parts being loosened; fourth, it must have a very large heating-surface in comparison with the volume of water to be evaporated, but not so large, however, that there is a difficulty connected with the feeding of the boiler, and, fifth, and finally, it must not have larger dimensions than a cylindrical boiler of similar heating surface. These points have been considered in the construction of the boiler which forms the subject of this invention and which is represented in the accompanying drawings.

Figure 1 is a front elevation of the boiler,

partly in section; Fig. 2, a transverse section, and Fig. 3 a plan partly in section.

. The boiler consists of two steam-collectors g and h, each connected almost throughout its length with a iiat water-reservoir at, which latter are connected together by a central part or intermediate boiler o.

The water-reservoirs d and the central part o of the boiler are traversed by a number of fire-tubes b, which carry off the heating-gases conveyed into the combustion-chamber a from the fire-grates m to the front smokechamber and the chimney e.

In order that the under part of the intermediate boiler 0 may be protected against the iiames and nevertheless a large heatingsurface obtained, it is connected by means of water-heating tubes s with longitudinal boiler-tubesz'and 7c, these water-tubes s eecting a rapid production of steam and an immediate circulation of the water. y

The water-heating tubes t, which limit or bound the combustion-chambern, connect the steam-collector g and the transverse boilertube Z and act to effect a rapid production of steam in-the same manner as the watertubes s.

Sheet-metal supports e, furnished with longitudinal slots f, serve to secure the intermediate boiler o in a fixed position.

I claim- A boiler comprising two superposed steamcollectors, a water-space with which they communicate and an *intermediate boiler, a hearth, a heater to either side of the hearth, a transverse boiler-tube connected with the heaters a combustion-chamber n extending upwardly in rear of the hearth, a series of water-heating tubes t connecting the transverse boiler-tube and one of the collectors and forming a wall of the combustion-chamber a series of water-heating tubes s separating` the intermediate boiler-space from the hearth and a plurality of fire-tubes b traversing said water-space and a portion of the intermediate boiler, substantialy as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

JOHANN SOHUTTE.

Witnesses:

C. NAAIcKsEY, .I OH. HAGEDORN. 

